Colored Dark Matter

Abstract

We explore the possibility that Dark Matter is the lightest hadron made of two stable color octet Dirac fermions $\mathcal{Q}$. The cosmological DM abundance is reproduced for $M_{\mathcal{Q}}\approx 12.5$ TeV, compatibly with direct searches (the Rayleigh cross section, suppressed by $1/M_{\mathcal{Q}}^6$, is close to present bounds), indirect searches (enhanced by $\mathcal{Q}\mathcal{Q}+\bar{\mathcal{Q}}\bar{\mathcal{Q}}\to \mathcal{Q}\bar{\mathcal{Q}}+\mathcal{Q}\bar{\mathcal{Q}}$ recombination), and with collider searches (where $\mathcal{Q}$ manifests as tracks, pair produced via QCD). Hybrid hadrons, made of $\mathcal{Q}$ and of SM quarks and gluons, have large QCD cross sections, and do not reach underground detectors. Their cosmological abundance is $10^5$ times smaller than DM, such that their unusual signals seem compatible with bounds. Those in the Earth and stars sank to their centers; the Earth crust and meteorites later accumulate a secondary abundance, although their present abundance depends on nuclear and geological properties that we cannot compute from first principles.

arXiv comment36 pages, 7 figures. v3: improved computation of the relic abundance; revised estimate of the indirect detection cross section

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• The Thermal History of Composite Dark Matter
• New physics of strong interaction and Dark Universe
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• Cosmic implications of a low-scale solution to the axion domain wall problem
• Dark matter astrometry at underground detectors with multiscatter events
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• Dark Matter, Dark Radiation and Gravitational Waves from Mirror Higgs Parity
• Glueballs in a Thermal Squeezeout Model
• Axion strings are superconducting
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• Excited bound states and their role in dark matter production
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• Going all the way in the search for WIMP dark matter at the muon collider through precision measurements
• Scalar Co-SIMP Dark Matter: Models and Sensitivities
• LHC Phenomenology of Dark Matter with a Color-Octet Partner
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• Axions, WIMPs, proton decay and observable $r$ in $SO(10)$
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• Using $\Delta N_{\mathrm{eff}}$ to constrain preferred axion model dark matter
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• The Smallest SU($N$) Hadrons
• Lowest Dimensional Portals to SU($N$) Exotics